1N4944GP-TP Equivalent & Substitute Parts

Part Overview

The 1N4944GP-TP is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. Manufactured by Micro Commercial Co, this component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Alternative parts with active product status are available to support ongoing maintenance, repair, and legacy system requirements where this diode specification remains applicable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4944GP-TP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents share all critical electrical specifications: 400 V DC reverse voltage, 1 A average rectified current, fast recovery speed classification (≤ 500ns), 5 µA reverse leakage at 400 V, through-hole mounting in DO-41 package, and -55°C to 150°C operating temperature range. These parts differ only in forward voltage drop (1.2 V to 1.3 V), reverse recovery time (35 ns to 200 ns), or capacitance values, which remain within acceptable tolerance for general-purpose rectification applications. Parametric equivalents include 1N4936GP-TP, FR104GP-TP, SF16G-TP, UF4004GP-TP, FR104G, FR104G A0G, FR104G R1G, and FR104T-G.

Similar Parts maintain the 400 V reverse voltage and through-hole axial package but differ in current rating or mounting configuration. MUR240RLG is rated for 2 A (double the 1N4944GP-TP current) and operates at -65°C to 175°C. VS-VSKE270-04PBF is a chassis-mount device rated for 270 A and operates at -40°C to 150°C; this part is suitable only for applications requiring significantly higher current capacity and different mounting geometry.

Substitution logic is based strictly on the following parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A (parametric equivalents) or higher (similar parts)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package / Case: DO-41 or DO-204AL (parametric equivalents)
Operating Temperature Range: -55°C to 150°C minimum

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Speed	Package	Temp Range [°C]	Product Status
1N4944GP-TP	Micro Commercial Co	400	1	1.3 @ 1 A	150	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Not For New Designs
1N4936GP-TP	Micro Commercial Co	400	1	1.2 @ 1 A	200	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
FR104GP-TP	Micro Commercial Co	400	1	1.3 @ 1 A	150	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
SF16G-TP	Micro Commercial Co	400	1	1.3 @ 1 A	35	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
UF4004GP-TP	Micro Commercial Co	400	1	1.3 @ 1 A	50	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
FR104G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1 A	150	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
FR104G A0G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1 A	150	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
FR104G R1G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1 A	150	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
FR104T-G	Comchip Technology	400	1	1.3 @ 1 A	150	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-55 to 150	Active
MUR240RLG	onsemi	400	2	1.3 @ 2 A	65	5 @ 400 V	Fast Recovery ≤ 500ns	DO-41	-65 to 175	Active
VS-VSKE270-04PBF	Vishay General Semiconductor - Diodes Division	400	270	—	—	50 @ 400 V	Standard Recovery >500ns	MAGN-A-PAK®	-40 to 150	Active

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The following parts are direct parametric equivalents with active product status and are suitable for applications requiring the 1N4944GP-TP specification:

1N4936GP-TP, FR104GP-TP, SF16G-TP, UF4004GP-TP, FR104G, FR104G A0G, FR104G R1G, and FR104T-G all maintain 400 V reverse voltage, 1 A average rectified current, fast recovery speed classification, and -55°C to 150°C operating temperature. All are ROHS3 compliant and REACH unaffected. Selection among these equivalents is based on packaging availability (Tape & Reel or Cut Tape), inventory levels, and reverse recovery time requirements for specific circuit performance.

For Higher Current Applications:

MUR240RLG is suitable when circuit requirements permit a 2 A rated device. This part maintains 400 V reverse voltage and fast recovery speed but extends the operating temperature range to -65°C to 175°C. Use this part only when the application circuit can accommodate the higher current rating and when the extended temperature range provides system benefit.

Not Recommended for Direct Substitution:

VS-VSKE270-04PBF operates at 270 A average rectified current with standard recovery speed (>500ns) and chassis-mount configuration. This part is fundamentally different in application class and mounting method and is not suitable as a substitute for the 1N4944GP-TP in general-purpose rectification circuits.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4936GP-TP as a direct replacement for 1N4944GP-TP?

A: Yes. Both parts are rated for 400 V reverse voltage and 1 A average rectified current with fast recovery speed classification. The 1N4936GP-TP has a lower forward voltage drop (1.2 V versus 1.3 V) and longer reverse recovery time (200 ns versus 150 ns). These differences are within acceptable tolerance for general-purpose rectification applications. The 1N4936GP-TP has active product status, making it the preferred choice for new procurement.

Q: What is the difference between SF16G-TP and UF4004GP-TP?

A: Both parts meet the 400 V, 1 A specification with identical forward voltage and reverse leakage characteristics. SF16G-TP has a reverse recovery time of 35 ns, while UF4004GP-TP has 50 ns. SF16G-TP is packaged in Cut Tape format, while UF4004GP-TP is also Cut Tape. The choice depends on circuit switching speed requirements and inventory availability. UF4004GP-TP has significantly higher inventory (15,757 pcs).

Q: Can I substitute MUR240RLG for 1N4944GP-TP?

A: MUR240RLG is rated for 2 A average rectified current, which is double the 1N4944GP-TP specification. It maintains the 400 V reverse voltage and fast recovery speed classification. Substitution is permissible only if the circuit design accommodates the higher current rating. The extended operating temperature range (-65°C to 175°C) provides additional margin. This part is suitable for applications where higher current capacity is beneficial or required.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This classification indicates the diode exhibits fast recovery characteristics with reverse recovery time not exceeding 500 nanoseconds when conducting currents greater than 200 milliamps. All parametric equivalents listed meet this specification, making them suitable for switching applications requiring rapid diode turn-off.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parametric equivalent parts (1N4936GP-TP, FR104GP-TP, SF16G-TP, UF4004GP-TP, FR104G, FR104G A0G, FR104G R1G, FR104T-G) and the similar part MUR240RLG are ROHS3 compliant. VS-VSKE270-04PBF is also ROHS3 compliant. All parts are REACH unaffected.

Q: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL refer to the same physical package designation for axial-lead through-hole diodes. The terms are used interchangeably in industry documentation. All parametric equivalent parts are available in this package format and are mechanically and electrically interchangeable.

Q: Why is 1N4944GP-TP marked "Not For New Designs"?

A: This designation indicates the manufacturer has superseded this part number in their active product line. Active alternatives with identical or superior electrical characteristics are available. For new circuit designs, select from the active parametric equivalents listed. For legacy system maintenance and repair, the 1N4944GP-TP remains available in inventory (887 pcs).

Q: Can I use FR104G from Taiwan Semiconductor Corporation instead of the Micro Commercial Co version?

A: Yes. FR104G from Taiwan Semiconductor Corporation meets all electrical specifications of the 1N4944GP-TP: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage drop, 150 ns reverse recovery time, and -55°C to 150°C operating temperature. The part is ROHS3 compliant and REACH unaffected. Inventory availability is 818 pcs.

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